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SL_REMAPPING_SP_PUB_CRYPTO_INVALID_SIGNATURE
What the protected licensing code means
SL_REMAPPING_SP_PUB_CRYPTO_INVALID_SIGNATURE (0xC004D20E) is emitted by cryptographic processing inside the security processor. It marks a specific point inside the provider, algorithm, key, hash, signature and block-processing stage used to authenticate protected licensing data: signature verification completed and the signature does not authenticate the supplied hash with the selected key.
This distinction matters because this is stronger than a format or length error: the comparison itself failed. A later “not licensed” state should not replace the first exact HRESULT in logs.
Where it sits in the licensing pipeline
Algorithm selection, key lookup, block formatting and signature verification are independent boundaries; a failure in one does not prove corruption at the others. To verify this, retain hash algorithm, computed digest, public-key thumbprint, signature format and signed-content provenance.
Cryptographic material should be logged by identifier, length, hash or thumbprint rather than by exporting secret keys or plaintext protected data.
Minimum data for a reliable diagnosis
- key type and key-material length
- cipher mode, block size and padding mode
- hash state and digest length
- signature format, length and verification key
- provider and algorithm identifiers
Similar symptoms, different conditions
| Result | Different condition |
|---|---|
SL_REMAPPING_SP_PUB_CRYPTO_INVALID_BLOCK | Compared with this result, an RSA operation produced or received a block that fails the structural checks for the selected operation. |
SL_REMAPPING_SP_PUB_CRYPTO_INVALID_SIGNATURELENGTH | Compared with this result, the signature byte count does not match the selected key and signature encoding. |
SL_REMAPPING_SP_PUB_CRYPTO_INVALID_FORMAT | Compared with this result, the RSA block encoding does not match the format required by the current operation. |
Testing the failing stage
- Identify the caller and operation instance that produced
0xC004D20E. - Collect the code-specific evidence: retain hash algorithm, computed digest, public-key thumbprint, signature format and signed-content provenance.
Recovery while preserving licensing evidence
Restore the authentic signed object and matching public key; do not bypass verification.
Representative case: A protected license file is modified after signing while its original signature remains.
Actions that usually destroy useful evidence
- Do not publish keys, decrypted license blobs or complete protected payloads in a support ticket.
- Do not disable signature or padding validation to make the operation continue.
Technical references
- CNG cryptographic primitive functions — supported state, API or recovery information relevant to this HRESULT.
- BCryptHashData — reference for evidence collection and post-repair verification.
- BCryptVerifySignature — technical contract for the subsystem producing it.
- Signing data with CNG — official platform context used to interpret it.
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